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Avaya IP Office™ Platform in a Branch Environment Reference Configuration
Centralized ATA phone to IP Office PSTN trunk call flow
A Centralized ATA phone is an analog phone for a Centralized user.
Sunny day
In Sunny day, the IP Office transparently relays the dialed string from the ATA user’s analog phone through the SIP INVITE sent to Avaya Aura® Session Manager and then to Avaya Aura® Communication Manager. This is shown in more detail in the following table.
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Call scenario
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Description of call signaling flow
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Call from ATA phone to IP Office PSTN trunk. The Centralized ATA user is registered with the IP address of IP Office.
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SIP INVITE from IP Office  Session Manager Communication Manager Session Manager IP Office PSTN
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For information about the call signaling and media flow with the Communication Manager call pick-up feature, see ATA phone invoking Communication Manager call pick-up feature call flow.
Rainy day
In Rainy day, the SM Line is not available, so all call routing and media is handled directly by the IP Office. IP Office routes the call from the user’s Centralized ATA phone to the IP Office PSTN trunk.